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5 Written questions

5 Matching questions

  1. What two things do we need to know to calculate work?
  2. What is a pulley?
  3. what is a machine?
  4. if you throw a ball, are you doing work? Explain.
  5. what is mechanical efficiency?
  1. a is a measure of how much of a machines energy is wasted, overcoming friction. No machine is 100% efficient, becuase there are always surfaces rubbing together.
  2. b a device that helps make work easier by changing the size or direction of a force.
  3. c you are only doing work on the ball as long as you are directly putting a force on it, in other words, when you are touching it.
  4. d we need to know the size of the force that was put on the object, and how far the object moved.
  5. e simple machine that is made of a wheel with a groove in it and a rope. it is usually used to life heavy objects.

5 Multiple choice questions

  1. a inclined plane that is wrapped in a spiral, usually on a rod, but not always.
  2. a simple machine that has a fulcrum, or pivot point.
  3. pushing a piece of heavy furniture up a ramp requires less input force, from you, than just lifting it up.
  4. turn a door knob (the wheel) the axle moves, to unfasten the door.
  5. the rate at which work is done.

5 True/False questions

  1. What is the formula for power?stays still, like the middle of a seesaw.

          

  2. What is an inclined plane?a simple machine with a straight, slanted surface.

          

  3. does a machine reduce the amount of work that is being done? Explain.Machines can change the size of the input force necessry. Also, they can change the direction of the force, which is especially helpfulo when we are trying to life somthing.

          

  4. ^ <--- Doing work?Yes

          

  5. ---> ----> Doing work?Yes

          

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